Match the graphs below with the equations following. $($Note that the $x$ and $y$ scales may be unequal.$)$

$($For each, enter the correct roman numeral, e$.$g$.,$ II$,$ without any punctuation.$)$

$($a$)y=1\mathrm{.}3+1\mathrm{.}4x$ : $($b$)y=-2\mathrm{.}8+2\mathrm{.}5x$ : $$

$($c$)y=-1\mathrm{.}3-2\mathrm{.}5x$ :

$($d$)y=-1\mathrm{.}6x$ :

$($e$)y=3x$ : $($f$)y=1\mathrm{.}3-2\mathrm{.}7x$ : $$